Namsan Magnetic Automatic Lock/Lockable Pet Screen Door Dog Gate Way Pet Door for Screens Color: Black,Size: 12"H x 16"W opening,Installs easily,For screen doors and windows Two ways of solving the problem of falling apart:1.more studs have been added for the screen; 2. four cable ties that can be repeatedly used have been provided for every package. (April, 2016) Fits all door and window screens, Suitable for all pets up to medium/large size dogs Durable, self-closing pet screen door,Not included the Screen Recommend FBA for You : 1--3 Days Delivery, Easy return, 30 Days Guarantee, Friendly Services Available in S,L Durable self-closing pet screen door For cats, small dogs, medium sized dogs and medium/large dogs. Install easily